feat(testing): add Anvil fork local testing infrastructure

Complete local testing setup with Anvil fork of Arbitrum mainnet:

Infrastructure:
- Docker Compose orchestration (Anvil, MEV Bot, Prometheus, Grafana)
- Anvil fork configuration with 1-second blocks
- Multi-stage Dockerfile for optimized builds
- Health checks and auto-restart policies

Configuration:
- Comprehensive .env.example with all parameters
- Prometheus metrics collection setup
- Grafana datasource provisioning
- .gitignore to prevent committing secrets

Testing Scripts:
- setup-local-fork.sh: Initialize fork and fund test wallet
- create-test-swap.sh: Generate test swaps for bot detection
- Both scripts include validation and helpful output

Integration Components:
- pkg/sequencer/reader.go: WebSocket reader for pending transactions
  - Worker pool pattern (10 workers)
  - <50ms processing target
  - Front-running capability
  - Auto-reconnection with exponential backoff

- pkg/pools/discovery.go: Pool discovery service
  - UniswapV2-style pools (SushiSwap, Camelot)
  - UniswapV3 pools (multiple fee tiers)
  - Factory contract queries
  - Liquidity filtering

Documentation:
- TESTING.md: Complete testing guide
  - Quick start instructions
  - Testing scenarios
  - Monitoring and debugging
  - Performance benchmarks
  - Troubleshooting guide

This enables safe local testing without deploying to public testnet,
using real Arbitrum mainnet state forked locally with Anvil.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

.env.example

@@ -0,0 +1,147 @@
+# MEV Bot V2 Configuration
+# Copy this file to .env and fill in your values
+
+# ============================================================================
+# NETWORK CONFIGURATION
+# ============================================================================
+
+# Arbitrum RPC URL (for forking with Anvil)
+ARBITRUM_RPC_URL=https://arb1.arbitrum.io/rpc
+
+# Block number to fork from (optional, defaults to latest)
+# FORK_BLOCK_NUMBER=latest
+
+# Local Anvil URLs (used by bot when running in docker-compose)
+# RPC_URL=http://anvil:8545
+# WS_URL=ws://anvil:8546
+# SEQUENCER_WS_URL=ws://anvil:8546
+
+# Production Arbitrum URLs (when not using Anvil)
+# RPC_URL=https://arb1.arbitrum.io/rpc
+# WS_URL=wss://arb1.arbitrum.io/ws
+# SEQUENCER_WS_URL=wss://arb1.arbitrum.io/ws
+
+# Private RPC endpoint (optional, for faster execution)
+# PRIVATE_RPC_URL=
+# USE_PRIVATE_RPC=false
+
+# ============================================================================
+# WALLET CONFIGURATION
+# ============================================================================
+
+# Private key for the wallet that will execute trades
+# IMPORTANT: Never commit this file with real keys!
+# Use a dedicated wallet for testing with test funds only
+PRIVATE_KEY=0000000000000000000000000000000000000000000000000000000000000000
+
+# ============================================================================
+# SMART CONTRACT ADDRESSES
+# ============================================================================
+
+# Flashloan executor contract (deployed on Arbitrum)
+# Leave as zero address if not deployed yet
+EXECUTOR_CONTRACT=0x0000000000000000000000000000000000000000
+
+# ============================================================================
+# TRADING PARAMETERS
+# ============================================================================
+
+# Minimum profit threshold (in wei, 0.01 ETH = 10000000000000000)
+MIN_PROFIT=10000000000000000
+
+# Minimum ROI percentage (1% = 0.01)
+MIN_ROI=0.01
+
+# Maximum slippage in basis points (200 = 2%)
+MAX_SLIPPAGE_BPS=200
+
+# Minimum swap amount (in wei, 0.001 ETH = 1000000000000000)
+MIN_SWAP_AMOUNT=1000000000000000
+
+# Minimum pool liquidity (in wei, 1 ETH = 1000000000000000000)
+MIN_POOL_LIQUIDITY=1000000000000000000
+
+# ============================================================================
+# RISK MANAGEMENT
+# ============================================================================
+
+# Maximum position size per trade (in wei, 10 ETH = 10000000000000000000)
+MAX_POSITION_SIZE=10000000000000000000
+
+# Maximum daily volume (in wei, 100 ETH = 100000000000000000000)
+MAX_DAILY_VOLUME=100000000000000000000
+
+# Maximum gas limit per transaction
+MAX_GAS_LIMIT=3000000
+
+# Gas price strategy (fast, normal, slow)
+GAS_PRICE_STRATEGY=fast
+
+# ============================================================================
+# ARBITRAGE DETECTION
+# ============================================================================
+
+# Maximum hops in arbitrage path
+MAX_HOPS=3
+
+# Maximum paths to explore per token
+MAX_PATHS=100
+
+# Maximum concurrent detection operations
+MAX_CONCURRENT_DETECTION=10
+
+# ============================================================================
+# EXECUTION SETTINGS
+# ============================================================================
+
+# Enable transaction simulation before execution
+ENABLE_SIMULATION=true
+
+# Enable front-running of detected opportunities
+ENABLE_FRONT_RUNNING=true
+
+# Number of confirmations to wait
+CONFIRMATION_BLOCKS=1
+
+# Transaction timeout (in seconds)
+TX_TIMEOUT=300
+
+# Maximum retries for failed transactions
+MAX_RETRIES=3
+
+# ============================================================================
+# POOL DISCOVERY
+# ============================================================================
+
+# Maximum number of pools to discover
+MAX_POOLS_TO_DISCOVER=1000
+
+# ============================================================================
+# PERFORMANCE TUNING
+# ============================================================================
+
+# Number of worker threads for transaction processing
+WORKER_COUNT=10
+
+# Transaction buffer size
+BUFFER_SIZE=1000
+
+# ============================================================================
+# MONITORING
+# ============================================================================
+
+# Metrics server port
+METRICS_PORT=9090
+
+# Log level (debug, info, warn, error)
+LOG_LEVEL=info
+
+# ============================================================================
+# TESTING CONFIGURATION
+# ============================================================================
+
+# Enable dry-run mode (log opportunities but don't execute)
+# DRY_RUN=false
+
+# Enable test mode with reduced thresholds
+# TEST_MODE=false